Skip to main content

Full text of "Practical Organic Chemistry"

See other formats


APPENDIX

of reactions by which triphenylmethane is converted into para-
rosaniline may be represented as follows : 

C8H5            /CJ-T4NOo            /CH4NH0            /CGH4NH.,

CH0 -> UC(- C6H4NO.", -> HC(-C6H4NH,; (HO)C(-C6H4NH;

Triphenylmethane.   Trin;;rethanPehenyl"      Paraleucaniline.           Pararo^niline

By the action of hydrochloric acid on the base, the hydro-
chloride of pararosaniline is formed, which is the soluble'
colouring matter,

HO.C(G;ll4NIT2)o + IIC1 = C(Ct!TI4NHo):>Cl H- H2O.

The constitution of the hydrochloride is doubtful ; but the
so-called quinonoid structure, by which the substance is repre-
sented as a derivative of quinone, is generally accepted,

C(C,H4NH.,)o
II

C

/\
ITC/         ^CII

'Gil



NIT. TIG.

Pavavosauiline hydrochloride.

The formation of rosaniline from a mixture of aniline, o- and
//-toluidine is represented by assuming that the methyl-group
of /-toluidine acts as the link which connects the nuclei of
aniline and ^-toluidine.

IIC ill II     C(5lI4NUo    +  30  =   HO-C^C6H4NHa   +  2H,O

Rosaniline base.

PREPARATION 103.
Benzaldehyde    Green.-The    formation   of   malachite
gre^n  (benzaldehyde   green) by the action   of  benzaldehyde